Question

How many vibrations are expected for PF5?

How many vibrations are expected for CH4?

How many vibrations are expected for PF3?

How many vibrations are expected for CH2O?

How many vibrations are expected for C2H6?

How many vibrations are expected for C2H5OH?

Answer #1

Normally

The degrees of vibrational modes for **linear
molecules** can be calculated using the formula

3N−5

The degrees of freedom for
**nonlinear molecules**
can be calculated using the
formula

3N−6, where, N is equal to the number of atoms within the molecule of interest.

for PF_{5} the number of
vibrations is 3X6 - 6 = 12 expected vibrations.

for CH_{4} the
number of vibrations is 3X5 - 6 = 9 expected vibrations.

for PF_{3} the number of vibrations is 3X3 - 6 = 3
expected vibrations.

for CH_{2}Othe number of vibrations is 3X4 - 6 = 6
expected vibrations.

for C_{2}H_{6} the number of vibrations is 3X8 -
6 = 18 expected vibrations.

for C_{2}H_{5}OH the
number of vibrations is 3X9 - 6 = 21 expected
vibrations.

3. Consider the SF4 molecule.
b) How many stretching vibrations does the molecule have, and what
are their symmetries? Which ones appear in an IR spectrum? Which
ones appear in a Raman spectrum? Sketch the stretching modes.
c) How many bending vibrations does the molecule have, and what are
their symmetries? Which ones appear in an IR spectrum? Which ones
appear in a Raman spectrum?
Dont forget to sketch the stretching nodes

Pt. A: How many moles of methane gas, CH4, are in a 1.00×106 L
storage tank at STP? Pt. B: How many grams of methane is this? Pt.
C: How many grams of carbon dioxide gas could the same tank
hold?

Consider the following unbalanced reaction. P4(s) + F2(g) PF3(g)
How many grams of F2 are needed to produce 186 g of PF3 if the
reaction has a 76.3% yield?

Distinguish between vibrations and w.aves.
(bl What is a simple harmonic motion (SHM)?
(c How do you determine, whether a vibrating body is undergoing
SHM?

Show work
A. Aluminum has a specific heat of 0.880 J/g-degree. How many
joules are needed to heat 725g of aluminum from 20.0oC
to 125.0oC ?
B. The delta H of combustion of C2H6 is
1541kJ/mole. How many kJ of energy result when 700.0g of
C2H6 are combusted ?

How many molecules of ethanol (C2H5OH) (the alcohol in alcoholic
beverages) are present in 135 mL of ethanol? The density of ethanol
is 0.789 g/cm3.

1. If 5.0g of CH4 react, how much H2O will be
formed?
2. If 5.0 g of CH4 reacted,how much energy would be
released or absorbed?

How many molecules are contained in each of the following
(scientific Notation)
2.66 mol S8
0.799 mol NH3
10.5 g of C2H5OH
1292 g of Cl2

Ethanol (the drinking alcohol) C2H5OH, has a density of 0.789
g/cm3. How many pounds of ethanol would be in a drum containing 5.0
gallons of ethanol?

C2H6(g) + O2(g) -->
CO2(g) + H2O(g)
(a) Consider the unbalanced equation above. How many grams of
O2 are required to react with 15.0 g of
C2H6? Use at least as many significant
figures in your molar masses as in the data given
g O2
(b) What mass of CO2 is produced?
g CO2
(c) What mass of H2O is produced?
g H2O

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